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changing yaw relative to roll

 
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changing yaw relative to roll
ctcrmcou
post 2 May, 2008 - 09:39 AM
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Hi,

I have no problem rotating my "camera" on the 3 axes. What I cannot figure out is how to apply a yaw change to my camera relative to the current roll angle, not the vertical axis.

Basically I track the yaw, pitch, and roll values to display my objects from the camera's point of view.

If I roll the camera, say 30 degrees, and then want to change the yaw by 20 degrees, I figure the yaw and pitch would both need to be adjusted somehow, depending on both the roll angle and the current yaw angle, since I want the objects on the screen to move horizontally across the screen.

If you follow me, please offer any suggestions.

Thanks.
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KYA
post 4 May, 2008 - 06:37 AM
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Why not move the objects along the x axis instead? Then your camera can have the scrolling effect and can move with the objects as well.

The only part that confuses me is that you say you want the objects to move horizontally (x axis), but want to change the roll and yaw of the camera to do it. Rolling is not the movement of an x or y axis it is "rolling" around, which won't give the appearance of horizontal movement.
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ctcrmcou
post 7 May, 2008 - 07:50 AM
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Thanks KYA,

What I meant by the "confusing part", is that the view from the camera from the spectators perspective would result in the objects seeming to move horizontally across the screen. This is where the roll of the camera is cancelled out by the panning left or right in the yaw, where actually a yaw and pitch adjustment are both happening simultaneously.

In any case, I've got another strategy to work this out. I'll create an object that can be yawed, rolled, and pitched (which do work correctly), and use it to represent the camera to pull its top corner coordinates to find the angles.

All this trig is so nuts. I've learned so much getting the wrong results.
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Codersys
post 21 May, 2008 - 11:33 AM
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It seems to me that you might be looking at this problem from the wrong perspective. I`m not overly sure that I know what it is your trying to do, but... You keep referring to the Angles of the Object & Camera.

It sounds to me that you should be using a Matrix to hold the Orientation of your Object 4x4 (or just 3 x Vector3 values). Plus a Matrix to hold the Camera Orientation. Use Matrix rotation to change the object/camera orientations instead of trying to store the current Angles of each axis. This method will give you alot more flexibility & control.
Also the movement of your object would then just be along its Zaxis or a Normalize version of the XY components of the Z axis(if you want the object to stay on the ground only!).

Hope I made some sense.

wink2.gif

ps. If you want to rotate the Orientation Axis relative to the orientation vectors XYZ (ie Row relative to Yaw) then let me know and I will post my rather big formula for you to use.

This post has been edited by Codersys: 21 May, 2008 - 11:35 AM
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